I believe it's a security limitation - they use passport authentication and
Google does support it. I suppose you could ask Google to sign on to the
passport program. :)
You can publish it to any WebDAV server so you could easily publish it to
any server and give friends and family access using typical authentication
methods, which should work for Google. (Although I haven't tested it with my
Google calendar.)
You could also get your own Google calendar and publish your outlook
calendar there...

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> When using the "Publish to Internet" feature of Outlook 2007, my Calendar
> is
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>
> http://www.microsoft.com/office/community/en-us/default.mspx?mid=7fe5a6de-4873-4
68b-8195-6bae34f74324&dg=microsoft.public.outlook.calendaring